Nighthawk X4S - stopped broadcasting wifi?

I've had our X4S for about 8-9 months, and it's successfully broadcast both a 2.4 and 5gHz signal through our house. However, a few days back, both signals simply disappeared. Nothing changed in our IPS service, and no power surges or outages. It just... left. I checked and saw that the device still showed illluminated lights next to both signals, which was odd. So I restarted the Router on the back of the device. It came back online lights-wise... but still no signal being broadcast. I also did a full power-pull after the button didn't work. Smae problem. Thing is, I know we are still getting a signal, because we have a third wifi solution in the form of a series of Luma Whole-Home Wifi devices. One plugs directly into the X4S on the back and broadcasts its own signal. That's been the setup since we moved in and got this device, and it still turns out a wifi signal. 

Anyone have ideas? We can't all be on the same wifi signal with a family of 5 all wanting a different Netflix show. Thanks!